23695351721 has 2 divisors, whose sum is σ = 23695351722. Its totient is φ = 23695351720.

The previous prime is 23695351679. The next prime is 23695351727. The reversal of 23695351721 is 12715359632.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23692905625 + 2446096 = 153925^2 + 1564^2 .

It is a cyclic number.

It is not a de Polignac number, because 23695351721 - 2¹⁸ = 23695089577 is a prime.

It is a super-2 number, since 2×23695351721² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (23695351727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11847675860 + 11847675861.

It is an arithmetic number, because the mean of its divisors is an integer number (11847675861).

Almost surely, 2^23695351721 is an apocalyptic number.

It is an amenable number.

23695351721 is a deficient number, since it is larger than the sum of its proper divisors (1).

23695351721 is an equidigital number, since it uses as much as digits as its factorization.

23695351721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 340200, while the sum is 44.

It can be divided in two parts, 23695351 and 721, that multiplied together give a palindrome (17084348071).

The spelling of 23695351721 in words is "twenty-three billion, six hundred ninety-five million, three hundred fifty-one thousand, seven hundred twenty-one".